sorry mate, firstly, I hate paint, I will do it though, more importantly though, I need more detailed schematics.
Where is the window in your picture?
Where is the door in your picture?
Can you drill holes in the walls / ceilings.

If you start with 100 plants, you will need different lighting, as I dont think you can lower the hps low enough to provide ample light needed for seedlings, also, from my experience seedlings work better with lower light, things like "mini fluros" or fluro tubes are better.
Nutrients: Don't know.
HPS lights that ship continental:
http://www.growshopalien.com/onlineshop/
I got my HPS from them, also the ballast apparently operates MH and HPS!
Mole2k4 Reviewed by Mole2k4 on . Need some help setting up the hp system for a full room !!! In about 1 month we will smoke my first own weed ...and me and my friend want to grow many plants for next growing... we want to grow in a full room. You can see room on attachment...can someone tell us how many 600W HPS Light's we need for that room full of plants...and how many plants can we grow in that room please? Rating: 5